ZN63A (VS1) Indoor 12kV Vacuum Circuit Breaker

**Product Overview**

The ZN63A (VS1) indoor high-voltage vacuum circuit breaker is engineered for

three-phase AC systems operating at 50Hz, with a rated voltage range of 7.2–12kV.

Designed for use in indoor switchgear, this unit plays a critical role in the

protection and control of power grid infrastructure and electrical systems within

industrial and mining facilities.

Built to meet rigorous safety and performance standards, the ZN63A (VS1) fully

complies with GB1984-89 for AC high-voltage circuit breakers, JB3855-96 for

3.6–40.5kV indoor vacuum breakers, DL403-91 for 10–35kV technical conditions,

as well as corresponding IEC international standards.

Equipped with a dependable mechanical and electrical interlocking system,

this circuit breaker ensures secure operation and effective fault isolation,

making it a trusted solution for modern power systems that demand

efficiency, safety, and long service life.

Main technical parameters

Item	Unit	Data
rated voltage	kV	12/24/40.5
Rated frequency	Hz	50
Rated 1-minute power frequency withstand voltage (phase to phase, ground to ground, port)	kV	42/65/95
Rated lightning impulse withstand voltage (phase to phase, ground to ground, port)	kV	75/118/125
Rated operating sequence		O-0.3S-CO-180S-CO

Item	Unit	Circuit breaker model
		C-GIS
Rated current	A	630	1250	1250	1600	2000	2500	1250	1600	2000	2500
Rated short circuit breaking current	kA	20/25		31.5				40
Rated short-circuit closing current (peak)	kA	50/63		80				100
Rated continuous short-circuit time	s	4		4				4
Rated short-circuit current breaking times	times	30		30				30
mechanical life	times	10000		10000				10000

Mechanical characteristic parameters of circuit breaker

name	Unit	Data
Contact opening distance	mm	12kV/9±1;24kV/13±1;40.5kV/18±1
Overtravel		3.5±0.5
Three phase opening and closing at different stages	ms	≤2
Bouncing time of closing contact	ms	12kV/ ≤ 2; 24kV/ ≤ 2; 40.5kV/≤3
Contact pressure of closing contact	N	20kA	25kA	31.5kA
		2000±200	2400±200	3100±200
Average opening speed	m/s	12kV/0.9~1.3; 24kV/1.1~1.6;40.5kV/1.8±0.2
Average closing speed		12kV/0.4~0.8; 24kV/0.6~1.0;40.5kV/0.8±0.2